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Okay I'm going to make it simple. You have a "Naturally Aspirated" rotary once you alter the exhaust it's going to be louder. Gutted cat opens the exhaust a degree & increases sound. Drilling the cat is a joke & provides no performance benefits, just noise. Test pipe adds to the over all increased flow & yes will be louder. A pre silencer will help keep sound down while increasing power. Cheap mufflers have the tendency to not sound good & be loud as well add no gain in power. You could mess around & end up with less power then from the factory. When talking about muffler choice sizing is just one factor, there still material, construction & design. These are some things will affect over all sound & power production.
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